Telephone system



Sept. 13, 1927. 1,642,500

W. C; KIESEL ET `AL fTELEPHONE SYSTEM 2 Filed Aug. l2, 1925 2 Sheets-Sheet 2 @f fLT ,byl

Patented Sepe 13,y 1927.

WALTER c. KI-EsEL," 0E MADISON,

QUEENS,

n i l 1,642,500 K f 1 STATES; PATENT0FF1CE. g i

y NEW JERSEY,.AND `CLARENCE n. EoWLER,j oE NEW YORK, AssreNoRs 'ro BELL VTELEPHONE LABORATORIES, INooR..

PORATEDOF YORK, N. Y., A CORPORATION OF NEW YORK.` Y

' TELEPHONE" sYsprEM, Y `4 i Application ined August 12`, ,1e25.ffserai 4932841 yThis invention relates to telephone sys tems and more particularly to improvements in service measuring arrangement-s as'applied to the use 'of connecting circuits in trunking systems. Y f j 4 Intelephone systems including trunk llines or cord circuits for the Completion of connections, a trunlrline, for example, outgoing from an A operators position may be selected by an A operator for the extend-A ing of connections to a B ope'rators position at a distant point. On the engagement of such a trunlrthe B opergors telephone set is automatically 'or manually connected to the incoming end thereof and the connection of the telephone set to engagedftrunlrs isoften done in an order depending on a numerical sequence ratlfien tlianin the order in' which t-he trunks become engaged.

` An object 'of` this v'invention istofprovide l improved means applieableto systems of type ,for the automaticvr connection of the opthe, above afndfsimilartypes for, counting the number of timesthevlines incoming to an 'Aoperators position are'engaged. *n i l To attain 'this andV other objects ofthe in'- vention as will hereinafter nappe`ar5one feaf' s ture of the invention resides inthe provision of means L'whereby a service 'meten or so-called peg-'counting meter operates 'to register but oncey for each time' a trunk is Vengaged `and whereby u releaseof the operators telephone set from a tri'inkeinployed.,in a connection. `.That is, the meter.a'fteijhaving once'operated to register the engagement of -`a trunky is entirely removed 'from control Yof said trunk until rthis trunk is again engaged in another, conl nection. j' Y This invention has been illustrated in connection with a trunlring systemofthe above in which a sequenceeircuit is ein loyed verators telephone set: to engage'trunks in a ynumerical sequence. The.y arrangementlis ysuch Vthat the peg-countmeter is 4actuated each time the B operators telephone set is disassociatedfrom va trunk. This disengagement ofV the operators telephone set takes .place when the' plug in which Ythe trunk terminates at the incoming end is.in serted Yin the jack of a line voutgoing from theB operatorsposition.

" In the accompanying drawings, Fig. 1 shows the incoming end of a trunk circuit the registration rtakes place on. :the

,and Thiscauses the operation vof relay which terminating f -at la.V B joperators position, a .Y

portion of the vsequence circuit whereby* the B o'peratoifs telephone'set maybe confk neclted to` engage'ftrunls in succession 'andl thev outgoing 'fendofqaftrunk or subsc'ribers line whereby afcall' incoming over the trunk may ybeextended beyond, Vwhile yFig;` 2v shows affB operat'ors telephone set and a'circuit arrangement'forf associating it with the sequenc'circuit f i flo'flmake clearY he functions ofthe inveni tion as applied to a trunking arrangement of this type, 5a detailed description'will be made of af connection established over the'trunk 5 tofsubscribefs line '6 from a distant oiice l (not shown) at which the outgoing 'endof thetrunlr terminates andwhere the 'connectionjis'completed in the` usualmanner from thelkcalling subscribers'line. In this `-den scription it willbe pointed out howl theifB operators 'telephone'f set 100 is' automati# 'cally'r connected to engage trunks t4in the order in which they are -numbered or jarranged' inthe'sequence circuit 1 0 and pai@ ti'cularly the` yconnection ofthev telephone set to trunk 5. It will also be pointed out' how the peg-count meter 101 isjoperated to register'the engagement- 'oftrunlr` 5 at the time thejo'p'erators telephone set isfrel'eased'from engaged trunk, this releaseV takingiplace when 'plug 11 oftrunk 5 is insertedL in jack `12ofthe subscribers line 6;It 'should be understood that this VinventionV is not limited in'its,application'to this particular type of 'y system but may equally wellbe applied to other systems suchras plug-ending cord. eircuits with which an operators telephone set i may be automatically or manually associated.

Assuming then that a connection is desired over trunk 5 andthatan.Aoperator at the'distant'end of this trunk has caused ythe tip and ring conductor thereof to be connectedy together in the usual manner tosg'- nalthe B operator that a' connection is de sired, the following circuit isjcompleted: Battery, lower outer armature andv back contact of relay 15, lower winding .of relay 16, ring conductor ofltrunk 5 over the loop at an A operators position to the tip conductor ofrtrunk ktliroughk the upper windingvof'relay 16 and upper inner armature back contact of relay 15 to ground.

in operating closes an olwiow :eirouit for ro lay 1T and also elosee` a circuit 'tor the lighting olt the guard lainp 18 as l'ollowez'llat tery, lanip 1S, resietaiice `lower inner armature and hack Contact ot' relay 15, lower outer arniaturc and hach contact of relay 20, armature and front Contact or relay 10 to ground. The lighting o1 lamp 18 indientes to the 1l operator, at- Wlrich poeltion trunlt 5 terminates, that a connection is desired over this trunk. ,'llie operation ol1v relay ll' completes connections to the sequence circuit 10 auch as a connection troni ground al ile upper arinature and front contact to lead 21 and a connection troni hatg tory at .its .lower arn'iature and haelt contact lo lead 22.

A description ot this sequence circuit 10 will now he inade, In ease the operators telephone set 100 is not connected at the time to any other engaged trunk it Will he ini niecliately coin'iecled to trnnh 5. lhe tiret operation towards accoinpliehingl this will he the operation of relay E25 over a circuit as follo ws, assuming that trunk 5 is nuinher one of the trnnlis that .may he connected to the operatorie telephone set: Battery 35, Winding of relay 25, conductor ,lower arinatiire and hack contact oi relay 10, upper ari nature and liront Contact oil relay 17 to `ground. The op eration of relay Q5 clonl )s an enerojizing cir cuit ilior relay Q as follows: lilattery, winding oit relay Q0, ariuature and liront Contact of relay 25, inalie-be:tore-lirealt contacts of relaye .25` and 2a to ground at 27. The operation ot relay 2li extends thrtiugh the operation o'l its armatures, the tip and ring' leads of trunk to the eonnnon leads 29 and 30, l'eepeetirely. 1t also connectev lead to a oonnnou .lead '31, .leadl-l, from lanip 1S, to a conunon lead -l-l and opone a connection troni liattery 35, through its louer inner armature and hack contact to corresponding contacts ol.t relay 20 and other interniiediate relays (not Shown) lor other trunlce -tor purposes as will hereinafter he deaerihed.

The connection olf lead. 323 to lead 81 eoinpletes a `Circuit :tor relay 102 as vlolloWf-x: Battery, Whaling,l ot relay 102, lead 31, lead 523, resistance 23. lower inner arniatur)l and liiack contact oit relay 15, lower inner armature and hack contact oit relay 20, armature and liront rontact ot relay l0 lo f ri'oinnl. This circuit cannes the operation oit relay 102 which in turn closes an obvious energizing circuit from relay 21,01 and relay 101 .in ener- ,frizing closes an olflvious energizing circuit for relay 105. lt should he noted that relays 104: and 105 are :Plow to operate eo that an appreciahle time interval will elapse before relay 105 ia operated after the operation of relay Q. lllhen relay 105 tinally operatesi, a. imriiiection ,ia niade at ite' armature and front `Contact directly to hattcry Ytroni lead 34. This connection shunts the connection l'roin ground at relay 10 to the battery through lamp 18 and relay 102, so that lamp 18 will non' hecoine extinguished and relay 102 released. On the release ot relay 102, relays 104v and 105 are in turn 1'cl \,1n'e l. On the releaae ot' relay 105 the shunt to hattery Vtor lead 3l .is removed and lainp It is again lighted, und .relay 102 is again operated. The reolnration oli' relay 109j cannes the repetition ot the ahove `cycle ot operation; and release ot relaye 101, 105, 102 and extinfr ruiahin;` of lamp lll, and consclpientiy the elo ing;` ot a connection hclween lead Ill and lead g3-l will ell'ect continued Flashing operations; olvl lanip 18. This lighting and extinfinishing ot' lainp 1S at intervalsl indicate-s to the B operator that the telephone set 100 in connected to trunk 5, itor it will he noted in the lfollmriilgi dencription that siinultaneonaly with the operations4 just descrihed :tor the flashing ot relay 18 the con ncction ot the set 100 has actually taken place.

0n the connection o1" lead 22 to lead 81, a circuit wan completed for relay 10T as 'follows: Battery, lower armature and front contact olf relay 1T, upper windingl of relay 19, 1nake-liel'ore-ln'eal contacte of relay 1), leads 2:2 and 31, armature and hack Contact of relay 108, upper Winding' olf relay 108, arma ture and hack Contact of relay 109, winding olI relay 10i" to ,gi-round. This causes the operation of relay 107 which in turn closes au obvious energizing circuit l'or relay 110. llelay 110 in operating' completes a locking` cir-- cuit :for .ilselli tlufough its lower outer arniature and front Contact to the n'iakeehelnrehrealt contacts olf relay 111,5 and aleo conn pieten a connection :troni a tone source 120 through the primary winding' oli repeating' coil 121, upper armature and hach Contact ol" relay 111, upper n'iiddle armature and liront contact ol relay 110 to ground. Relay 110 alro connects the secondary oit the repealing* coil 121 lo the tip and, ring conductors ot trunk 5 over a circuit as :followi: Tip conductor of trunk 5, upper inner arnfiature and front con taet of relay 20, conductor 20, upper inner armature and hack contact ot relay 110, upper outer arnlature and `lront contact oi relay .110. Secondary winding' ol repeating coil 121, upper inner armature and :lront coittict o't' relay 110, lower inner armature and hachr contact of relay 110,` eondiutor 30, lower outer armature and lront contact of relay and rincj conduetor oi' trunk The operation el relay 110 therefore through ite` connections tor the tout` aouree 120 to the tip and ringr conductors ol trunk o causen a tone to lie. transmitted over the trunk to the ontgoing end at the A opirratora poaition and an is n'ell-lnou'n in the art this lone io heard hy the A operator through her telephone eet.

The l'ollon'ing operations of relays 111, 112,

connected to a trunk '.v

-`113,1`114i-,-1155and 11:6 will cause the altery uate'ieinOval andapplication of the tone to thev Af' operators position,

servingas an indication to the A operator that the B operators telephone set is l yThe operation ot ,these "relays to accomplish this purpose will now ybe described. It will be noted that on theoperation of `relay 110, an obvious circuit Y coil`121 troni the tone source 120 so thatl iscoinpleted for the operationofV relay 111.

"Ihe operation ot relay 111 opens the circuit through the priniary winding of` repeating Iwhenthis relay operates, the tone is'reinoved 1 'troni the tip and ring conductors of trunk 5.

' Relay 111 is 'however slovvto operate so that thetone'applied bythe operation of relay '110 will l'be of a suilicient duration to be for the slow ation of ,relayf 112 again closes' a circuit fcoil 191 `ing circuit heard bythe A`ope'rator. -On the operatifonof relay .111' an obvious circuit is closed throughv thepriinary winding of repeating l troni ground at its upper arinature and front Contact through the upperarinature andv back contact of relay 113 so that `when 4relayy 112 operates after a certain pef `ri`od`a tone will be againfapplied tothe tip andrring conductors of trunk' 5. The operh 'ation ot relay 112 closes an obvious energiz- 'or the' slow to operate relay 113 so'tliat beforev relay llhoperates` the tonewill have beenk transmitted to the. A operator "'tor a period oftiineapproxiinately ont the ,saine length caitiono'f tone'toy the A operator. The option'of relaysllA closes anobvious energiz- Y. .circuit for the slow tooperate relay 1111 livliich now closes a'circuit through the priera as the period of theftirst` applir `inaiy"windingof repeating coil 121 so that a third application of tone K Vthe tip'and ring conductors of trunlr and' V`heard by the A operator.r 'oli relay 11d an obvious energizing circuit is On the operation closed for theslow to operate'relay 115.

:The operation of relay 115 opens the locking circuit for relay 110 previously tracedbut as ielay`z107 is stilloperated, relay 11() will not release ati this time;

The operation of relay 115 also closes an obvious energizing circuit Vio'rlrelay 116 which in operating opens the `Vconnections roinl k'repeating coil 121 to `conductors 29 and 30 and trunk 5 and consequently upon the operthe secondary winding of ation ot this relay, the third and last application ot tone to the A operator is re` inoved. The operat-ion of relay 116 now con- "iiects at its inner upper and lower armatures t vand front contacts the tip and ring con vconductors 29 and 30, so that the connection ductors ofthe operators telephone set to the ,troni this operators telephone set is now completed to the tip and ringy conductors of* trunk 5. y

'When the A operator receives the above these signals ris niade through i mentioned "signals, she' willV understand thereby that the B operators telephone set is connected to trunk 5 VAand she will then transniit the number of the wanted subscriber to which the B operator is to cornpletea connection. Asthe above operations,

- that is, the connection of the B operators telephone sat to the trunk` 5, the signaling of the A operator# and the `flashing of lainp 18 talrc place practically simultaneously the B operator willfbe prepared for thel recepv`the operators telephone set 100 is engaged the circuits will function as ollows10ntlie engagement oit trunk 5, relay will operate directly troni batteryy but relay 26 will not becoine energized as the circuit for this relay to ground at 27 Vis broken at the maltebeforebreak contactsfof relay 25 so thatia connection ofthe operators telephone setl 1020 to 'trunk 5 lcannottalze lplace until it has beenv disengaged 'liroin the trunk Vassociated with relays 25 and 26 and not until the release On ythe other handA if, for

of 'relay 25. exaniple, the trunk associated withV the vrelays 25 'and 26 is the one with which the operators telephone set isengagedat Vand 26 becoines engaged, this latter trunk' -phone set until. relays 26 and 25 are released, as relay 26 will vbe prevented from operating ducl to the fact that the circuit for this'relayvwill be broken at the inake-andf break Contact ot relay 25.

Another n eX- ainple ii'iiglitbefinentioned: in case the op- -erators telephone set is 'engaged with trunk 5 and the'trunkV-associated with relays 26 and 25 becomes engaged, the operators tele- Yphone set cannot be connected with this trunk as the circuit for relay 25 will be opened at the innerlower armature-and back contact of relay 26 so that relay 25 cannot operate and close the circuit for relay 26. Also after the operators telephone set is connected to trunk 5 and the trunks associaterd with relays 26 andV 25 and 26 and 25 becoines engaged while the operators set is still connectedto trunk 5, the trunk asso. ciated with relays 26 and 25 will be connected to the operators telephone set iirst.

On' the operation of relay 25 the circuit for relay 26 froin ground at-27 will be opened. i Returning now -to completiony of the contheA tiine the trunk associated with relays 25 i vcannot be associated with the operators telev of peg count meter 101, upper armature and front contact of relay 115,

kuntil a cycle of operation such as just described for the relays 110 to 115 is again caused to take place due to the operation of relay 107.

lease of relay 107 a short-circuit to ground is closed rfor leads 31 through tlie upperV outer armatureV and front contacts of relay 116 to ground at the armature and back contact of yrelay 107 so that` relay 107 cannot again operate untilrelay 11G has released. This arrangement insures the completion of one cycle of operation of move t-he operators telephone set V100 `iai-om the common leads 29 and 30 before battery on lead 31 that may again be connected thereto in case another trunk has in the meantime begun the operations for the association of the operators telephone set 100 With that trunk Will have any effect on the relays mentioned. In accordance with this arrangement, therefore, the operation of the peg-countmeter 101 will not take place until the operators telephone set'has been automatically disconnected from the trunk 5 due tothe insertion of the plug 11 into jack 12. The meter 101 cannot therefore be again Operated due to anyaccidental operations that may take place in a trunk connection such as, for example, if the plug 11 is teinporarily removed from jack 12. In accordance with this invention, therefore, the piegcount meter 101 will register only once for each connection established by a trunk in the make-before ybreak contacts of relay 112 to ground. As

yIt will be noted that on the ife-A these relays to regroup yhaving access tothe operators telephone set 100.

Relays 108 and 109 are provided in conjunction Witli a key shown below relay 109 to release the operators set 100'froin a trunk if for any reas-on theV operator cannot complete a connection and the apparatus for automatically performingthis function is not brought into play or if it fails to function. On depression of the release key relay d 109 is operated and the connection between lead 31 and relay 107 is broken, thus releasing' relay 107 With the result described. Ground is then connected to both windings of relay 108 but as long as a battery connection is maintained over lead 31 relay 108 does not operate since one winding opposes the other. As soon as the battery connection vto lead 31 is broken, relay 108 operates through its lower Winding and this connection will be maintainedas long as the release key is depressed, thus preventingthe operation of the release key from being effective on more than one trunk for a single depression of the key. Vlien the key isy released, relays 108 and 109'r-elease.

, IVhat is claimed is:

In a telephone system, link circuits, an operators telephone set, means for connect ing said set to one of said link circuits coinprising a train of relays sequentially oper-at ed for connecting said set to said one of said link circuits, said train of relays con-V trolling means to transmit signalingcurrent over said link circuit` means .to disconnect said set from said link circuit and release said train of relays sequentially, a meter, 

